Supercharging fan for internal-combustion engines



Patented Mar. 10, 1931 UNITED STATES PATENT OFFICE SUPERCHARGING FAN FOR INTERNAL-COMBUSTION ENGINES Application filed February 14, 1929, Serial No. 339,891, and in Great Britain March 17, 1928.

This invention relates to the fans or rotors of superchargers for internal combustion engines, of the kind having radial blades and adapted to be driven at very high speeds.

With rotors of this kind trouble is some? times experienced due to the vibration of the blades which causes them to fracture, and to overcome this they are sometimes attached at the back to a shroud, or back plate.

The object of the present invention is to provide a rotor of small dimensions and weight, but of high efficiency, in which the blades will be amply supported against vibration and fracture.

According to this invention, the blades are supported from the hub of the rotor as well as from a back plate which forms the shroud.

In the accompanying drawings,

Figure 1 is a front view, and

Figure 2 a section on the line 11-11 of Figure 1 illustrating an approved construction.

Like numerals indicate like parts through- 25 out the drawings.

In this construction, the rotor or fan is What I claim as my invention and desire to secure by Letters Patent of the United States is An impeller consisting of a solid piece of steel havlng a hub and radial blades, a transi5 verse circular plate integral with the hub and radial blades and uniting said hub and said blades as far as the plane through the points of intersection of said blades, the said blades meeting the hub at a point most remote from the plate in a common lane.

In testimony whereof I affix my signature.

' FREDERICK ROBERTSON SMITH.

formed from a solid piece of steel and it comprises a hub 2 which is bored at 3 for attachment to its shaft. Integral with the 30 hub is a back plate which takes the form of a disc 4 extending out to, or nearly to, the periphery of the complete rotor. The blades 5 are in one with the hub and back plate, and extend from the hub, being supported thereby. They are preferably radial, and they taper, being narrowest near their periphery, as shown in Figure 1. Also the back plate may taper as shown in Figure 2, and preferably the gap between the blades is, in section, curved as shown at 6 so as to form a gradual sweep from a cylindrical or conical portion 7 coaxial withthe axis of the rotor to a radial portion 8 near the periphery, (see Figure 2), which results in higher .efliciency.

In this manner the blades are amply supported and cannot vibrate, and yet the shroud can be extremely light as the blades are not wholly supported from it, and very'efiicient delivery is obtained. 

